Submission #70478

# Submission time Handle Problem Language Result Execution time Memory
70478 2018-08-23T03:55:31 Z spencercompton The Forest of Fangorn (CEOI14_fangorn) Java 11
50 / 100
3000 ms 64744 KB
import java.awt.geom.Line2D;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
 
public class fangorn {
	public static double eps = 1e-9;
	public static class Obj implements Comparable<Obj>{
		public double dx, dy;
		public boolean g;
		Obj(double a, double b, boolean c){
			dx = a;
			dy = b;
			g = c;
		}
		public int compareTo(Obj o) {
			return Double.compare(Math.atan2(dy, dx), Math.atan2(o.dy, o.dx));
		}
	}
	public static int h, w;
	public static boolean sect(double sx1, double sy1, double ex1, double ey1, double sx2,
			double sy2, double ex2, double ey2) {
		if(Line2D.linesIntersect(sx1, sy1, ex1, ey1, sx2, sy2, ex2, ey2)) {
			return true;
		}
		if(Line2D.ptSegDist(sx1, sy1, ex1, ey1, ex2, ey2) < eps) {
			return true;
		}
		if(Line2D.ptSegDist(sx2, sy2, ex2, ey2, ex1, ey1) < eps) {
			return true;
		}
		if(Math.abs(sx1-sx2)<eps && Math.abs(sy1-sy2)<eps) {
			return true;
		}
		return Math.abs(ex1-ex2)<eps && Math.abs(ey1-ey2)<eps;
	}
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		w = in.nextInt();
		h = in.nextInt();
		int gx = in.nextInt();
		int gy = in.nextInt();
		int c = in.nextInt();
		boolean[] ok = new boolean[c];
		Arrays.fill(ok, true);
		double[][] bases = new double[c][2];
		for(int i = 0; i<c; i++) {
			for(int j = 0; j<2; j++) {
				bases[i][j] = in.nextInt();
			}
		}
		int n = in.nextInt();
		double[][] trees = new double[n][2];
		for(int i = 0; i<n; i++) {
			for(int j = 0; j<2; j++) {
				trees[i][j] = in.nextInt();
			}
		}
		ArrayList<Double> sy = new ArrayList<Double>();
		ArrayList<Double> sx = new ArrayList<Double>();
		ArrayList<Double> ey = new ArrayList<Double>();
		ArrayList<Double> ex = new ArrayList<Double>();
		for(int i = 0; i<n; i++) {
			ArrayList<Obj> li = new ArrayList<Obj>();
			for(int j = 0; j<n; j++) {
				if(i==j) {
					continue;
				}
				li.add(new Obj(trees[i][0]-trees[j][0],trees[i][1]-trees[j][1],false));
			}
			li.add(new Obj(gx-trees[i][0],gy-trees[i][1],true));
			Collections.sort(li);
			for(int j = 0; j<li.size(); j++) {
				if(!li.get(j).g) {
					continue;
				}
				int ind = (j+li.size()-1)%li.size();
				double dx = li.get(ind).dx;
				double dy = li.get(ind).dy;
				double len = Math.sqrt(dx*dx + dy*dy);
				dx /= len;
				dy /= len;
				double lo = 0.0;
				double hi = 1.0;
				while(true) {
					double nx = trees[i][0] + dx*hi;
					double ny = trees[i][1] + dy*hi;
					if(nx>=0 && nx<=w && ny>=0 && ny<=h) {
						hi *= 2.0;
					}
					else {
						break;
					}
				}
				int cnt = 0;
				while(hi>lo && cnt<500) {
					cnt++;
					double mid = (lo+hi)/2.0;
					double nx = trees[i][0] + dx*mid;
					double ny = trees[i][1] + dy*mid;
					if(nx>=0 && nx<=w && nx>=0 && ny<=h) {
						lo = mid;
					}
					else{
						hi = mid;
					}
				}
				sx.add(trees[i][0]);
				sy.add(trees[i][1]);
				ex.add(trees[i][0] + dx*lo);
				ey.add(trees[i][1] + dy*lo);
				
				
				ind = (j+1)%li.size();
				dx = li.get(ind).dx;
				dy = li.get(ind).dy;
				len = Math.sqrt(dx*dx + dy*dy);
				dx /= len;
				dy /= len;
				lo = 0.0;
				hi = 1.0;
				while(true) {
					double nx = trees[i][0] + dx*hi;
					double ny = trees[i][1] + dy*hi;
					if(nx>=0 && nx<=w && ny>=0 && ny<=h) {
						hi *= 2.0;
					}
					else {
						break;
					}
				}
				cnt = 0;
				while(hi>lo && cnt<500) {
					double mid = (lo+hi)/2.0;
					cnt++;
					double nx = trees[i][0] + dx*mid;
					double ny = trees[i][1] + dy*mid;
					if(nx>=0 && nx<=w && nx>=0 && ny<=h) {
						lo = mid;
					}
					else{
						hi = mid;
					}
				}
				sx.add(trees[i][0]);
				sy.add(trees[i][1]);
				ex.add(trees[i][0] + dx*lo);
				ey.add(trees[i][1] + dy*lo);
			}
		}
		for(int i = 0; i<sx.size(); i++) {
			for(int j = i+1; j<sx.size(); j++) {
				if(!sect(sx.get(i),sy.get(i),ex.get(i),ey.get(i),sx.get(j),sy.get(j),ex.get(j),ey.get(j))) {
					continue;
				}
				double lo = 0.0;
				double hi = 1.0;
				double dx = ex.get(j)-sx.get(j);
				double dy = ey.get(j)-sy.get(j);
				int cnt = 0;
				while(hi>lo && cnt<500) {
					cnt++;
					double mid = (lo+hi)/2.0;
					if(sect(sx.get(i),sy.get(i),ex.get(i),ey.get(i),sx.get(j),sy.get(j),sx.get(j)+dx*mid,sy.get(j)+dy*mid)) {
						hi = mid;
					}
					else {
						lo = mid;
					}
				}
				double px = sx.get(j)+dx*lo;
				double py = sy.get(j)+dy*lo;
				double a1 = Math.atan2(ey.get(i)-py, ex.get(i)-px);
				double a2 = Math.atan2(ey.get(j)-py, ex.get(j)-px);
				if(a1>a2) {
					double tmp = a1;
					a1 = a2;
					a2 = tmp;
				}
				double ag = Math.atan2(gy-py, gx-px);
				for(int k = 0; k<c; k++) {
					double acur = Math.atan2(bases[k][1]-py, bases[k][0]-px);
					if((acur>=a1 && acur<=a2) != (ag>=a1 && ag<=a2)) {
						ok[k] = false;
					}
				}
			}
		}
		ArrayList<Integer> ans = new ArrayList<Integer>();
		for(int i = 0; i<c; i++) {
			if(ok[i]) {
				ans.add(i+1);
			}
		}
		System.out.println(ans.size());
		if(ans.size()>0) {
			System.out.print(ans.get(0));
			for(int i = 1; i<ans.size(); i++) {
				System.out.print(" " +ans.get(i));
			}
			System.out.println();
		}
	}
}
# Verdict Execution time Memory Grader output
1 Correct 195 ms 11544 KB Output is correct
2 Correct 184 ms 11628 KB Output is correct
3 Correct 162 ms 11628 KB Output is correct
4 Correct 202 ms 12248 KB Output is correct
5 Correct 187 ms 12248 KB Output is correct
6 Correct 193 ms 12248 KB Output is correct
7 Correct 699 ms 22760 KB Output is correct
8 Correct 656 ms 22760 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 257 ms 22760 KB Output is correct
2 Correct 288 ms 22760 KB Output is correct
3 Correct 482 ms 22760 KB Output is correct
4 Correct 497 ms 22760 KB Output is correct
5 Correct 582 ms 22760 KB Output is correct
6 Correct 1156 ms 28712 KB Output is correct
7 Correct 185 ms 28712 KB Output is correct
8 Correct 211 ms 28712 KB Output is correct
9 Correct 473 ms 28712 KB Output is correct
10 Correct 2124 ms 41440 KB Output is correct
11 Correct 2406 ms 41440 KB Output is correct
12 Correct 2608 ms 41440 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 208 ms 41440 KB Output is correct
2 Correct 313 ms 41440 KB Output is correct
3 Correct 312 ms 41440 KB Output is correct
4 Execution timed out 3065 ms 59700 KB Time limit exceeded
5 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Execution timed out 3093 ms 64744 KB Time limit exceeded
2 Halted 0 ms 0 KB -